Programming Forums > Application Development > Java

tsofras · Dec 27th, 2005, 8:11 AM

Hello there, i am trying parsing a xml file into a document using java, but i am getting an exception. Below is the code:

(Toggle Plain Text)

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;

public class testDOM
{
 public void main (String[] args) 
{
		try
                  {
			String File = "settings.xml";
                        DocumentBuilderFactory factory =               DocumentBuilderFactory.newInstance();
			factory.setValidating(true);
			DocumentBuilder builder = factory.newDocumentBuilder();
            builder.parse(File);
			System.out.println("\n\n----" + builder.parse(File));
		}catch(Exception e)
		{
			e.printStackTrace();
		}
}
}

And the exception is:

(Toggle Plain Text)

C:\j2sdk1.4.2_10\bin\java -Didea.launcher.port=7538 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 5.0\bin" -Dfile.encoding=windows-1253 -classpath "C:\j2sdk1.4.2_10\jre\lib\charsets.jar;C:\j2sdk1.4.2_10\jre\lib\jce.jar;C:\j2sdk1.4.2_10\jre\lib\jsse.jar;C:\j2sdk1.4.2_10\jre\lib\plugin.jar;C:\j2sdk1.4.2_10\jre\lib\rt.jar;C:\j2sdk1.4.2_10\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_10\jre\lib\ext\dnsns.jar;C:\j2sdk1.4.2_10\jre\lib\ext\ldapsec.jar;C:\j2sdk1.4.2_10\jre\lib\ext\localedata.jar;C:\j2sdk1.4.2_10\jre\lib\ext\sunjce_provider.jar;C:\j2sdk1.4.2_10;C:\Projects\testDOM\classes;C:\Dom4J\dom4j-1.6.1.jar;C:\Program Files\JetBrains\IntelliJ IDEA 5.0\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain testDOM
java.lang.NullPointerException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:86)
Exception in thread "main" 
Process finished with exit code 1

Any ideas? I tried to compile it using dom4j library but i have a problem with the Document declaration. Any help will be appreciated
Thx in advance

titaniumdecoy · Dec 27th, 2005, 12:58 PM

First of all, you should make the variable File start with a lowercase letter, or it appears to be a class name. This will confuse many Java developers and is considered bad form.

The problem might be that you are passing in a String rather than File variable for the XML file's location. You may also need to use an absolute path to the file you are trying to use. So try the following:

(Toggle Plain Text)

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;

public class testDOM {
    public void main(String[] args)  {
        try {
            File file = "/path/to/settings.xml";
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.setValidating(true);
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document dom = builder.parse(file);
            System.out.println("\n\n----" + dom);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }
}

titaniumdecoy · Dec 27th, 2005, 3:52 PM

I made a mistake in the code above: File file = "/path/to/settings.xml"; should be File file = new File("/path/to/settings.xml");.

tsofras · Dec 28th, 2005, 1:32 AM

Thx my friend, finally i tried to do it using SAXBuilder and it worked ok, maybe it was a problem because i was using dom4j library and i had some problems

Dec 27th, 2005, 8:11 AM	#1
tsofras Programmer Join Date: Jul 2005 Location: Athens,Greece Posts: 39 Rep Power: 0	JAVA XML Parsing Hello there, i am trying parsing a xml file into a document using java, but i am getting an exception. Below is the code: (Toggle Plain Text) import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; public class testDOM { public void main (String[] args) { try { String File = "settings.xml"; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setValidating(true); DocumentBuilder builder = factory.newDocumentBuilder(); builder.parse(File); System.out.println("\n\n----" + builder.parse(File)); }catch(Exception e) { e.printStackTrace(); } } } import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; public class testDOM { public void main (String[] args) { try { String File = "settings.xml"; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setValidating(true); DocumentBuilder builder = factory.newDocumentBuilder(); builder.parse(File); System.out.println("\n\n----" + builder.parse(File)); }catch(Exception e) { e.printStackTrace(); } } } And the exception is: (Toggle Plain Text) C:\j2sdk1.4.2_10\bin\java -Didea.launcher.port=7538 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 5.0\bin" -Dfile.encoding=windows-1253 -classpath "C:\j2sdk1.4.2_10\jre\lib\charsets.jar;C:\j2sdk1.4.2_10\jre\lib\jce.jar;C:\j2sdk1.4.2_10\jre\lib\jsse.jar;C:\j2sdk1.4.2_10\jre\lib\plugin.jar;C:\j2sdk1.4.2_10\jre\lib\rt.jar;C:\j2sdk1.4.2_10\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_10\jre\lib\ext\dnsns.jar;C:\j2sdk1.4.2_10\jre\lib\ext\ldapsec.jar;C:\j2sdk1.4.2_10\jre\lib\ext\localedata.jar;C:\j2sdk1.4.2_10\jre\lib\ext\sunjce_provider.jar;C:\j2sdk1.4.2_10;C:\Projects\testDOM\classes;C:\Dom4J\dom4j-1.6.1.jar;C:\Program Files\JetBrains\IntelliJ IDEA 5.0\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain testDOM java.lang.NullPointerException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:86) Exception in thread "main" Process finished with exit code 1 C:\j2sdk1.4.2_10\bin\java -Didea.launcher.port=7538 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 5.0\bin" -Dfile.encoding=windows-1253 -classpath "C:\j2sdk1.4.2_10\jre\lib\charsets.jar;C:\j2sdk1.4.2_10\jre\lib\jce.jar;C:\j2sdk1.4.2_10\jre\lib\jsse.jar;C:\j2sdk1.4.2_10\jre\lib\plugin.jar;C:\j2sdk1.4.2_10\jre\lib\rt.jar;C:\j2sdk1.4.2_10\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_10\jre\lib\ext\dnsns.jar;C:\j2sdk1.4.2_10\jre\lib\ext\ldapsec.jar;C:\j2sdk1.4.2_10\jre\lib\ext\localedata.jar;C:\j2sdk1.4.2_10\jre\lib\ext\sunjce_provider.jar;C:\j2sdk1.4.2_10;C:\Projects\testDOM\classes;C:\Dom4J\dom4j-1.6.1.jar;C:\Program Files\JetBrains\IntelliJ IDEA 5.0\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain testDOM java.lang.NullPointerException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:86) Exception in thread "main" Process finished with exit code 1 Any ideas? I tried to compile it using dom4j library but i have a problem with the Document declaration. Any help will be appreciated Thx in advance

Dec 27th, 2005, 12:58 PM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 856 Rep Power: 3	First of all, you should make the variable File start with a lowercase letter, or it appears to be a class name. This will confuse many Java developers and is considered bad form. The problem might be that you are passing in a String rather than File variable for the XML file's location. You may also need to use an absolute path to the file you are trying to use. So try the following: (Toggle Plain Text) import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; public class testDOM { public void main(String[] args) { try { File file = "/path/to/settings.xml"; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setValidating(true); DocumentBuilder builder = factory.newDocumentBuilder(); Document dom = builder.parse(file); System.out.println("\n\n----" + dom); } catch(Exception e) { e.printStackTrace(); } } } import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; public class testDOM { public void main(String[] args) { try { File file = "/path/to/settings.xml"; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setValidating(true); DocumentBuilder builder = factory.newDocumentBuilder(); Document dom = builder.parse(file); System.out.println("\n\n----" + dom); } catch(Exception e) { e.printStackTrace(); } } }

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Dec 27th, 2005, 3:52 PM	#3
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 856 Rep Power: 3	I made a mistake in the code above: File file = "/path/to/settings.xml"; should be File file = new File("/path/to/settings.xml");.

Dec 28th, 2005, 1:32 AM	#4
tsofras Programmer Join Date: Jul 2005 Location: Athens,Greece Posts: 39 Rep Power: 0	Thx my friend, finally i tried to do it using SAXBuilder and it worked ok, maybe it was a problem because i was using dom4j library and i had some problems

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Programming Forums > Application Development > Java

JAVA XML Parsing